Data/hora: 11/06/2024 13:54:22

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 27/02/2013
Data da última atualização: | 19/05/2023
Autoria: | LUCENA, C. C. de; SIQUEIRA, D. L. de; MARTINEZ, H. E. P.; CECON, P. R.
Afiliação: | CICERO CARTAXO DE LUCENA, CNPMF; DALMO LOPES DE SIQUEIRA, UFV; HERMÍNIA EMILIA PRIETO MARTINEZ, UFV; PAULO ROBERTO CECON, UFV.
Título: | Salt stress change chlorophyll fluorescence in mango.
Ano de publicação: | 2012
Fonte/Imprenta: | Revista Brasileira de Fruticultura, Jaboticabal, v. 34, n. 4, p. 1245-1255, dez. 2012.
Idioma: | Inglês
Conteúdo: | This study evaluated the tolerance of mango cultivars 'Haden', 'Palmer', 'Tommy Atkins' and 'Uba' grafted on rootstock 'Imbú' to salt stress using chlorophyll fluorescence. Plants were grown in modified Hoagland solution containing 0, 15, 30, and 45 mmol L-1 NaCl. At 97 days the parameters of the chlorophyll fluorescence (F0, Fm, Fv, F0/Fm, Fv/Fm, Fv'/Fm', 'PSII = [(Fm'-Fs)/(Fm')], D = (1- Fv'/Fm') and ETR = ('PSII×PPF×0,84×0,5) were determined. At 100 days, the leaf emission and leaf area, toxicity and leaf abscission indexes were determined. In all cultivars evaluated, in different degree, there were decreases in photochemical efficiency of photosystem II, enhanced concentrations from 15 mmol L-1 NaCl. The decreases in the potential quantum yield of photosystem II (Fv/Fm) were 27.9, 18.7, 20.5, and 27.4%, for cultivars 'Haden', 'Palmer', 'Tommy Atkins', and 'Uba', respectively, when grown in 45 mmol L-1 NaCl. It was found decreases in leaf emission and mean leaf area in all cultivars from 15 mmol L-1 NaCl. There were increases in leaf toxicity of 33.0, 67.5, 41.6 and 80.8% and in leaf abscission of 71.8, 29.2, 32.5, and 67.9% for the cultivars 'Haden', 'Palmer', 'Tommy Atkins', and 'Uba' respectively, when grown in 45 mmol L-1 NaCl. Leaf toxicity and leaf abscission were not observed in 15 mmol L-1 NaCl. The decrease in Fv/Fm ratio were accompanied by decreasing in leaf emission and increased leaf toxicity index, showing, therefore, the potential of chlorophyll fluorescence in the early detection of salt stress in mango tree.
Palavras-Chave: | Crescimento vegetativo; Estresse salino; Mango.
Thesagro: | Manga; Mangifera Indica.
Thesaurus Nal: | Photosystem II.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)

Exemplares:

CNPMF - (29299-1) - UPC - AP - PP - SP/13092 -  - 13092 - PCT
CNPMF - (29299-2) - UPC - AP - DD - Publicação digital -  -  - DIS